The Seattle, WA graticule is at latitude 47, longitude -122. It completely encloses the cities of Seattle, Tacoma, and Olympia, as well as the surrounding large cities. This graticule encloses most of the Puget Sound and essentially encompasses the major hub of western Washington.

On the first Thursday of each month, all the major museums in Seattle are free. This would be a good time to get some culture, and maybe meet up with some people who like XKCD. Check the websites for current exhibits, to plan which ones you care to visit.